David Walsh Blog

• By Tomek PoniatowiczNovember 22, 2021

  GraphQL Editor – The Journey from Initial Release to Version 5.0

  From the very beginning of our adventure with GraphQL, we were impressed by how great its community is. The amount of content, libraries and great tools generated by GraphQL users amazed us from the very start. The more time we spent working with GraphQL the more...

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• By David WalshNovember 7, 2021

  Array.prototype.at

  Working with arrays is an essential skill in any programming language, especially JavaScript, as we continue to rely on external data APIs. JavaScript has added methods like find and `findIndex recently, but one syntax I love from languages like Python is retrieving values by negative indexes.When...

• By David WalshNovember 3, 2021

  Fast, Accurate Geolocation Data with IPWHOIS.io

  In the world of marketing and content targeting, having accurate geolocation data can be the difference between a thriving enterprise and a floundering business. Accurate data is everything, especially in the targeted marketing. When you need trustworthy geolocation data, IPWHOIS.io is a great...

• By David WalshOctober 24, 2021

  Command Line trash

  One of the first commands you learn when experimenting with command line is rm, the utility for deleting files and directories. Deletion is a core computer UI operation but operating systems use a "Trash" paradigm, where files are stored before truly deleted. With the...

• By David WalshOctober 10, 2021

  Terminate Process on a Port from Command Line

  Once a week I have to deal with a zombie process or try to start a process that's already running on its designated port. In most cases I use macOS's Activity Monitor to kill the process, which is time-consuming. What if we could just...

• By David WalshOctober 4, 2021

  CSS accent-color

  For better or worse, form fields have been somewhat difficult to style with CSS. Form control display is dependent upon device, operating system, and browser, so you can imagine the difficulty in making styling easy. We have slowly been given some controls over form control...

• By David WalshSeptember 29, 2021

  How to Create a UUID in JavaScript

  The UUID identifier has been used in programming since the days a baby-faced David Walsh became a professional software engineer. My first exposure to UUIDs was via a ColdFusion app I inherited and ... the less we say about that the better. In any...

• By David WalshSeptember 17, 2021

  AggregateError

  One of the big themes of the web these days is concurrency, which leads to accomplishing tasks asynchronously. In doing so, the possibility of multiple errors can occur. Instead of providing a generic error, optimally you'd provide a wealth of error information. TheAggregateError...

• By David WalshAugust 27, 2021

  jq for JSON

  I old enough to remember when we thought XML was going to change the programming world...then JSON saved us from that hell. Parsing and querying JSON data is fundamental task we've all coded for, but sometimes I just want to get some data locally with minimal...

• By David WalshAugust 23, 2021

  React usePrevious Hook

  Hooks are essential for the functional component pattern in React. One frequent logic comparison with class components was comparing a previous prop value with a current prop value via lifecycle methods. So what's an easy pattern for duplicating previous value comparisons in functional components?The useRef and...